_________ the right kind of training , these teenage soccer players may one day grew the international stars.
| A．Giving | B．Having given | C．To give | D．Given |
Nowadays people sometimes separate their waste to make it easier for it .
| A．reusing | B．reused | C．reuses | D．to be reused |
When he the door, he found his keys were nowhere.
| A．would open | B．opened | C．had opened | D．was to open |
In April, 2009, President Hu inspected the warships in Qingdao,the 60th anniversary of the founding of the PLA Navy.
| A．marking | B．marked | C．having marked | D．being marked |
The sunlight is white and blinding, hard-edged shadows on the ground.
| A．throwing | B．being thrown | C．to throw | D．to be thrown |